Running Ubuntu 16.04.3 LTS with a 6GB GTX 1060 Nvidia card with 32 gigs of RAM. When I launch a game (Stellaris), I get weird mouse lag. When I leave the game, the mouse lag persists. When I reboot the machine, the mouse lag seems to end. I ma using the proprietary 384.90 Nvidia Driver.
I should also point out I am using dual monitors, in case that seems to be related. I'm guessing it is not.